Quote:Hutzal, it's quite unfair of you to state that the line is not all its cut up to be. It's now been proven that it WAS producing the advertised power. Once Randy took it one or two notches PAST, it shut down.

Strange that when Audioholics was testing theirs, they were producing up to 120db peaks? Outside? I can't really remember the numbers.

The fact is, the amp is perfect for some speakers, and for others it seems to have a problem.

I am not actively looking at the moment for a separate, as I am eagerly awaiting Axiom's debut.

Strange that when Audioholics was testing theirs, they were producing up to 120db peaks?Measuring at 1 meter? Speaker efficiency & ohms? Could have very well been.

The fact is, the amp is perfect for some speakers, and for others it seems to have a problem. But is it really a problem when you push it past what it was designed to deliver? Don't forget, Randy was really happy for a couple of months before he got SPL crazy at the Taj Mahal there.

Regardless, I agree that I wouldn't be happy either, and would graciously accept their offer to take it back.

Keep in mind that, due to the limitation of the RS meter, we don't have accurate data about how loudly the M80s are actually playing when the amp shuts down. I see absolutely NO reason to return it, whatsoever.

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"I wish I had documented more…" said nobody on their death bed, ever.

Quote:I'm going to pick up a piezzo tweeter from Radio Shack to run the test Lonnie told me about. This will tell me when my Denon starts to clip.

Randy, If you want to run a distortion test on the Denon, then you will need run a low frequency sine wave through the system like 60-80hz. Set your Denon so that it is in PLIIx mode so all speakers are playing. Connect the piezo in parellel with one of you main speakers. I would recommend that you run a long speaker wire so that you will be farther away from the actual main speaker and can hear the tweeter better. Bring up the volume until you hear a buzzing in the tweeter. Listen carefully (like have the tweeter near your ear) and as soon as you hear anything from the tweeter, you are hearing the distortion from the amp and note the location of the volume control. This is how loud you can turn it up without distortion going to your speakers. You will probably be able to turn up the volume a lot more, but you will also notice as you turn up the volume the noise in the tweeter will also increase which means more distortion to your speakers.

I just thought that if you are going to give it a shot, I would give you a quick run down of the proper way.

BTW. I am out of the office right now, but will either call or email you later today.

Is the RPA-1 based on the same design as the MPS 1 and what is the transformer size of the 2 channel unit?

The RPA-1 is based on the same design as the MPS-1. They are both Dual Tracking Class H amplifiers but the RPA does not have the wave form limiter (hard core stereophiles want all the dynamics they can get) and the transformer is slightly larger (400VA/ per channel vs. 350VA on the MPS-1). This increase in copper will offer greater dynamics but will not sustain a continuous increase in SPL. Also the VI sense on the protect circuit will still kick in if the amp is run into hard clip.

I went to RS, and the guy had no idea what I was talking about. I searched their website, but not really finding anything called a Piezo Tweeter? I see them on Ebay. Maybe Radio Shack no longer sells them, hmmmm.